Anatomy · MU Sofia

CNS · 156. Afferent and efferent cerebellar connections.

Covers the afferent and efferent connections of the cerebellum, organised by the three cerebellar peduncles. The inferior peduncle section sets out its afferent tracts in a table giving each tract's function, origin and termination, and then lists its efferent tracts. The middle peduncle is described as carrying only ponto-cerebellar afferents. The superior peduncle section lists its two afferent tracts and four efferent tracts, the efferent ones forming most of its fibres.

Inside: 1 section · 2 labelled pictures · 1 table · 10 flashcards · 3 min

Topic 143 of 264 in the MU Sofia syllabus for Anatomy (Dental Medicine, Year 2). The free AceMed note covers it in 1 section, about 228 words (3 min of reading), with 10 flashcards.

In this note

  1. CEREBELLAR CONNECTIONS

CEREBELLAR CONNECTIONS

Inferior Cerebrall pudencle: (ICP)

* Afferent pathways: from different regions of the CNS to the cerebellar cortex.

Middle Cerebrall Pudencle:

*Types of fibres in the M.C.P.: it contains afferent Fibres only (ponto cerebellar fibres) which arise from the pontine nuclei of the opposite side. These fibres constitute a part of the Cortico-ponto-cerebellar pathway (from the cerebral cortex to cerebellum)

Superior Cerebellar Puduncle (SCP)

*Types of fibres in the S.C.P.:

(A) Afferent fibres: only 2 tracts :

  1. (1) Anterior spinocerebellar T.
  • origin & course: see page 61
  • it carries proprioceptive impulses from the lower limb to the cerebellum.
  1. (2) Tecto-cerebellar T.
  • arises from the sup. & inf. colliculi of the tectum of midbrain.
  • it carries auditory & visual impulses to the Cerebellum.

(B) Efferent fibres: (form the majority of fibres)

  1. (1) Dentato thalamic T.:

arises from the dentate nucleus, crosses to the opposite side in the midbrain then ascends to end in the intermediate ventral nucleus of thalamus.

  1. (2) cerebelle-rubral T.:

arises from the globose & emboliform nuclei, crosses to the opposite side in the midbrain then ascends to end in the red nucleus.

  1. (3) Dentato-olivary T.:

arises from the dentate nucleus, crosses to the opposite side in the midbrain then descends to the inf. olivary nucleus in the medulla.

  1. (4) Fastigio-reticular:

arises from the Fastigial nucleus & descends uncrossed to the reticular formation of the pons & medulla.

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